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\(0,875-0,15+0,25-0,85-0,125+0,6+0,4+0,123\)
\(=\left(0,875-0,125+0,25\right)-\left(0,85+0,15\right)+\left(0,6+0,4\right)+0,123\)
\(=1-1+1+0,123\)
\(=1+0,123=1,123\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,123\) x \(5+0,123:0,25+0,123\)
\(=0,123\) x \(5+0,123\) x \(4+0,123\)
\(=0,123\) x \(\left(5+4+1\right)\)
\(=0,123\) x \(10\)
\(=1,23\)
0,123 x 5 + 0,123 : 0,25 + 0,123
= 0,123 x 5 + 0,123 x 4 + 0,123
= 0,123 x ( 5 + 4 + 1 )
= 0,123 x 10
= 1,23
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(0,123\cdot450+1,23\cdot55\)
\(=1,23\cdot45+1,23\cdot55\)
\(=1,23\left(45+55\right)=1,23\cdot100=123\)
b: \(0,234\cdot3700+23,4\cdot62\cdot26\cdot9\)
\(=23,4\cdot37+23,4\cdot62\cdot26\cdot9\)
\(=23,4\left(37+62\cdot26\cdot9\right)=340353\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,123 x 5 + 0,123 x 4 + 0,123
= 0,123 x (5+4+1)
=0,123 x 10
= 1,23
0,123 x 5 + 0,123 x 4 + 0,123
= 0,123 x (5+4+1)
=0,123 x 10
= 1,23
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Sửa đề:\(4,89\cdot4,5+4,89\cdot4,5+4,89\)
\(=4,89\cdot\left(4,5+4,5+1\right)\)
\(=4,89\cdot10=48,9\)
b: \(0,123\cdot7800+1,23\cdot220\)
\(=1,23\cdot780+1,23\cdot220\)
\(=1,23\left(780+220\right)\)
\(=1,23\cdot1000=1230\)
c: \(0,4\cdot0,45\cdot2,5\)
\(=0,4\cdot2,5\cdot0,45\)
\(=1\cdot0,45=0,45\)
d: \(0,2\cdot5,55\cdot50\)
\(=0,2\cdot50\cdot5,55\)
\(=5,55\cdot10=55,5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: x*2,3-4,6=2,3
=>x*2,3=6,9
=>x=3
b: =0,123(5+4+1)
=0,123*10
=1,23
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 87 x 0,123 + 14 x 0,123 - 0,123
= 87 x 0,123 + 14 x 0,123 - 0,123 x 1
= ( 87 + 14 - 1 ) x 0,123
= 100 x 0,123
= 12,3
b) 25 x 12,5 x 0,4 x 0,8
= ( 25 x 0,4 ) x ( 12,5 x 8 )
= 10 x 100
= 1000
c) 23 + 26 + 29 + .... + 56
Khoảng cách cách đều là 3.
Số số hạng là : ( 56 - 23 ) : 3 + 1 = 12 ( số )
Tổng là : ( 56 + 23 ) x 12 : 2 = 474
a, 0,123 x (87+14-1)
=0,123 x 100
=12,3